Screw-punch.



F. TORKA.

SCREW PUNCH.

APPLIOATIQN FILED PEB.18, 1908.

905 ,766. Patented Dec. 1, 1908.

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FRANCIS TORKA, OF SAN FRANCISCO, CALIFORNIA.

SCREW-PUNCH.

Specification of Letters Patent.

Fatented Dec. 1, 1908.

Application filed February 18, 1908. Serial No. 416,625.

To all whom it may concern:

Be it known that I, FnANcIs TORKA, a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful Improvements in Screw-Punches, of which the ollowing is a specification.

This .invention has for its object to provide simple and efficient tool or device for cutting holes in strips of hardened metal, such as steel tapes, clock-springs and other articles wherein it is desired to punch or cut holes for rivets.

The device is produced and intended chiefly for the use of surveyors in the field, to afford a means whereby holes for rivets maybe made in a broken steel-tape, and the parts united by splicing and riveting them together at the break. It will be found a convenient and serviceable tool for the jeweler and the mechanic on account of the readiness with which it can be adjusted to the work its cutting quality, and the ability afforded in its construction of repairing the cutting member when it becomes broken.

To these ends and objects, chiefi the invention comprises a slotted base-b ock, and a screw carrying a rotatable punch or cutting tool all of novel construction, combined for operation, all as hereinafter more particularly described and pointed out in the claims at the end of this specification.

The following description explains at length the nature of my said invention, and the manner in which the same is produced and constructed, the accompanying drawing being referred to therein by figures and letters.

Figure 1 of the drawing represents in plan or top-view a cutting-punch of my invention, with a broken piece or section of a steel-tape laced in position to be punched for rivets.

ig. 2 is a vertical sectional view of the tool, showing in longitudinal section all the parts but the cutting-punch. Fig. 3 is a side elevation, taken from the ri ht of Fig. 2. Figs. 4 and 5 represent in detai and removed from the screw-follower, the cuttingunch and the thrust-block against which t e head of the punch bears. Fig. 6 illustrates a portion of a surveyors steel-tape repaired by splicing the parts of which have been punched in my new cutting-punch. Fig. 7 is a view of the pin adapted to hold a tape in position while eing punched.

The part a, designated the bed-block, is

best formed out of a solid block of metal by cutting the slot 2 from one side horizontally into the metal, and drilling or otherwise cutting a hole 3 for the follower or screw 1) through the metal overlying the slit 2, and a smaller hole 4 through the metal below the slit, to admit the cutting end of the punch. The hole 4 is centrally located, in line with the axis of the screw 5, and its position is usually in the center of the bed-block, midway between the ends. A second hole 5 extending clear through the bed-block parallel with the axial line of the punch is located at one side of such line and at such distance therefrom that it will serve to determine the distance between the holes being cut. Thus, in the operation of cutting the holes for two rivets, either in the tape t, or in the splicingstrip 8, after the firsthole is cut, the tape or strip is moved in the bed-block slit until that hole is brought in line with the hole 5 in the bed-block, and while the tape is held in that position the second hole is cut by screwing down the punch. A loose pin, or piece of wire, inserted through the hole 5 after the cut hole in the tape is brought in line with the llOle 5 will serve to retain the strip in position while the next hole is being cut in it. The hole 5 thus forms a gage for determining the proper position of the metal strip for the next hole. In addition to this means for spacing the holes longitudinally, the tool is provided with a gage for regulating the dis tance of the holes from the sides of the metal strip so that it is possible always to make several holes in the metal strip on the same longitudinal central line or at uniform diswhether a wide or a narrow metal-strip is being punched. This lastmentione d gage comprises two set-screws 1012 extending through the bed-block in line with the back face 9 of the slot 2, so that their ends may be projected or set into the slot a greater or less distance by turning the screws; each one having a milled head for that purpose. The gage-marks d on the side of the bed-block are provided for convenience in setting the screws to center or aline a metal strip of given width without loss of time.

A novel feature in the cutting punch of my invention consists in making the cuttingtool a separable and removable part and in giving it the quality of turning independently of the operating-screw, instead of mak- 1 ing it a fixed part of such screw. For that tance from one edge of the metal-strip,

purpose the punch comprises a body portion 14 of cylindrical form, having a' taper pointed upper end 15, and with the cutting or drilling point 16 on the lower end of reduced diameter so as to form a shoulder 17 above the cutting point. The actuatingscrew 1), is bored and finished to receive the punch; a seat 18 being formed in the bore to take the shoulder 17 on the punch. The central bore in the screw extends downward from the bottom of the enlarged cavity in the head of the screw, and the head is provided with a removable capstan-bar 23 or cross-pin for turning the screw. Between the cross-pin 23, and the bottom of the cavity the thrust-block 24, fills the space and is held down against the tapered head 15 of the punch by the cross-pin. In the bottom of the block 24 is an indentation to receive and form a center-bearing for the pointed end 15; and the block 24 is removably fitted in the cavity of the head. To remove the punch it is only necessary to drive out the cross-pin 23 and then remove the thrust-block 24. That part of the tool is readily replaced when worn; or drill-points of different sizes may be used in the same bed-block.

A tool of this construction will be found convenient and serviceable for cutting holes for rivets in metal strips, such as surveyors tape-lines, and for other purposes where holes are to be made in hardened metal strips. It will be seen that as the punch is adapted to turn in the screw 1), when in operation, it will produce a hole with a clean-cut What I claim as my invention is:-

1. A tool for cutting holes in metal strips, comprising the bed-block having a slot extending through it, a screw having a bore extending centrally through it, and fitted to a threaded socket at right angles to and intersecting the slot on the bed-block, a punch removably fitted to the bore in the screw, a bar secured to the upper end of the screw, and a thrust-block against which the head of the punch is arranged to bear, arranged between the punch and the said bar.

2. A cuttingunch comprising a bedblock having a s ot extending through it, a threaded socket in that portion of the block above the slot, a rotatable screw follower in said socket, having a central bore, extending entirely through it and provided with a seat, a punch removably fitted to said bore and provided with a shoulder near one end to engage the seat in the bore of the follower, and a removable block in the head of the screw as a means for taking the thrust of the punch and confining it in place.

3. A tool comprising a bed block provided with an opening extending through it and a threaded socket at right angles to the opening, a follower in said socket having a bore extending entirely through it, the said bore being reduced at one end and enlarged at its opposite end, a punch mounted in the said bore and having a reduced portion extending throu h the reduced portion of the bore in the fo lower, a turning bar for the follower, and a block mounted in the enlarged ortion of the bore between the punch and t e said bar and constituting an abutment for the punch.

4. A tool comprising a bed block provided with an opening extending through it and a threaded socket at right angles to the 0 ening, a follower in said socket having a ore extendin entirely through it, the said bore being en arged at its outer end, a punch mounted in the said bore, a block mounted in the enlarged ortion of the bore between the punch and t e said bar and constituting an abutment for the unch, and means for holding the block in p ace.

5. The herein described cutting unch comprising a slotted block, a screw fo lower having a central bore, a punch removably fitted to said bore, means for confining said punch therein and a removable gage pin in the bed.block intersecting the slot therein at right angles.

6. The herein described cutting-punch comprising the slotted bed-block; the screw follower having a central bore; a punch removably fitted to said bore, means for confining said punch in the bore; a removable gage-pin in the bed-block intersecting the slot t erein at right angles; and the adjustable gage-screws on the back of the bedblock.

FRANCIS TORKA.

Witnesses: v

EDWARD E. OSBORN, L. OSBORN. 

